Telephone system



Mjarch 10, 1931. w. KUSCHE ET AL 1,795,494

TELEPHONE SYSTEM Filed Dec. l2. 1928 3 Sheets-Sheet 1 0 L go 00 W KUSCHE/A/l/ENTDRS R. DAHMS f:- PFLE/DERER March '10,- 1931. y w KUSCHE E1' AL1,795,494

TELEPHONE SYSTEM Filed Dec. l2, 1928 3 Sheets-Sheet 2 F/E. 2d if WKUSCHE /NVEA/TURS H, UAH/4.5

F PFLE/DERER 5y v A T'RNE Y March 10, 1931. w, KUSCHE ET AL 1,795,494

'TELEPHONE SYSTEM Filed Dec. l2, 1928 3 Sheets-Sheet 3 Hs. .3d

Il II IIHIHIIIH W. ffl/55H5 /NVEA/m/'s DAHMS E PFLE/DERER ATTRNEYPatented Mar. 10, 1931 UNITE STATES PATENT OFFICE WALTER KUSCE-IE, OFBERLIN-GHARLOTTENBRG, RUDOLF DAI-IMS, 0F CEIARLGCTEN- BURG, AND FRITZPFLEIDFHFF, CF RFFTTTLC'LTAF-OTTENBURG, GER-MANY, .AS- EGNQB-S TOSEEDENS & EAL-SHE AKTIENGESELLSCHAFT, OF SIEMENSSTADT, BERLIN,GERI/IANY, .A COMPANY OF GERMANY TELEPHONE SYSTEM Application ledDecember 12, 1928, Serial No. 325,534, and in Germany December 15, 1927.

Tris invention relates to telephone systems and particularly to systemsin which communication channels involving speech ampliliers or repeatersare built up by automatic switches responsive to dial impulses.

lt is an object o' this invention to render speech ainpliiiersaccessible over automatically established connections commonly availableto a plurality of lines of different characteristics.

A feature of the invention is a means for automatically adjusting thecharacteristics of the speech amplifier taken for use to thecharacteristics of the line. Each amplilier has associated with it anautomatic switch which is set into operation upon the seizure of theamplifier and which then automatically moves into a particular positioncorrespond ing to the line from which the connection is extended and inwhich position artificial networks corresponding to the characteristicsof such line are appropriately connected to the amplifier.

In accordance with another feature of the invention the amplilier isproperly adjusted in the manner set forth in accordance with thecharacteristics of both the calling and the called line.

In accordance with a further feature of the invention the calling linesare divided into groups and in each group all the lines have the samecharacteristics so that the amplifier is adjusted in accordance with thegroup from which the call originates.

The drawings consist of three sheets designated Fig. 1, Fig. 2 and Fig.3 and when placed as indicated in Fig. 4l diagrammatically illustratethe essential features of the invention. Fig. 2a represents circuits andapparatus identical with those of Fig. 2 and Fig. Se represents circuitsand apparatus identical with those of Fig. 3.

The calling lines are arranged in groups wherein each line of a grouphas the same characteristics as each other line of that group and thelines of one group may differ in their characteristics from the lines ofother groups. In this manner switch 1 having arms 2, 8 and 4L isaccessible through any well known line switch or line finder arrangementto lines of one characteristic and the switch 5 having arms 6, 7 and 8is accessible to lines of another characteristic. Only one level of suchswitches is here represented, it being understood that the same orsimilar wiring arrangements are made in other levels, that the differentlevels are directively selected and that the contacts in each level areautomatically selected. Y

The irst contacts of the banks of these selectors, as shown, aremultipled together and extend to a secondary selective switch. ylihusthe iirst contacts ot the banks traversed by arms 2 and 6 are connectedtogether and extend to arm 9 of switch 12 and the first contacts of thebanks traversed by arms 3 and 7 are connected together and extend to arm10 of switch 12. The first contacts of the banks traversed by thecorresponding testing arms 4 andl 8 are not multipled, as usual, butlead to a series of relays 13 and 14, respectively. Thus when the arm 4is set on its iirst contact, a circuit will be completed to the win dingof relay 13, whence the circuit will extend over the normal contacts ofthe inner right hand armature of relay 13, the back contact and lefthand armature of relay `13, the back contact and left hand armature ofrelay 14, theback contact and left hand armature of relay 15, thewinding oi relay 16, to ground. Since a battery connection (not shown)is made over the arm 4:, relays 13 and 16 will be operated. Relay 13will then lock through its alternate contact and inner right handarmature directly to the winding of relay 16 and the chain circuitthrough the left handv armatures of this series of relays will bebroken. Hence, another selector, such as 5, testing its first contactswill ind a busy condition denoted by the absence of the groundconnection to the Contact traversed by arm 8. As long as the selector 1remains set on its first contacts, relay 13 individual to switchml` willremain operated in series with relay 16 which is individual to switch 12and no other selector, such as 1 or 5, can gain access to the selector12.

In a similar manner the second contacts of the selectors l. and 5 aremultpled together and lead to a secondary selector 17, having arms 1S,19 and 20. Likewise, the second contacts traversed by the testing, arms4 and S are connected to a seiies of relays 21, 22 and 23 controlling arelay 24 individual to selector 17. rlhus it will be seen that a callcoming in over either selector 1 or 5 will be automatically extended inthe rst instance to selector 12 and the first contacts in the banks ofthe remaining switches of this group will be rendered busy by thebreakingr of the chain circuit through relays 13, 14 and 15. Similarly,it will be noted that the next call comino; in over either of such firstselectors will be automatically extended to selector 17 and thereafterthe second contacts in the banks of the remaining' iii'st selectors willbe rendeied busy by the breakingy of the chain circuit through the lefthand armatures of relays 21, 22 and Q3.

Each of the secondary selectors 12 and 17 is shown with two levels, itbeing` understood, as befoi'e, that the different levels are directivelyselected and the contacts in the levels are automatically selected. lnthe present case the first contacts in each level shown and in eachswitch shown are multipled 'io- Aeether and lead to a single speechamplifier. The testing contacts, however, are not multiplcd but haveindividual conductors extending therefrom to a. plurality of relays in anumber of chain circuits, somewhat in the same manner as in connectionwith the first selectors. Thus when either of the secondary selectorshas been directively set on either of its two levels shown and has thenautomatically selected its first contact, one of the relays 25 to 29will be operated in series with relay and by opening` a chain eircuitincluding the outer left hand armature and back contact of one of suchchain relays will prevent any other selector from approprinting` thesame speech amplifier. ln a similar manner when the first contacts ofthe secondary selectors are passed over and a .set of second contactsare selected, then a relay within F 2a similar in all respects to one ofthe chain relays 25 to Q9 will be operated in series with a relaysimilar to relay 30 and the chain circuit controlled thereby will beopened and the second contacts traversed by arms 11 and 20 will loemarked as busy.

New by the combination of the third wire testing; relays which areoperated'the characteristics of the calling;l line will be known at thespeech amplifier. Let it be assumed that the secondary selector 12 hasbeen first selected and that thereafter the conductors 3l, 'which extendto the speech amplifier shown in the upper part of Fig. 3, have beenselected by settingarms 9 and 10 on their first contacts in the secondlevel shown. This results in the energization of relay 2G and theconsequent establishment of a ciralso associated with the intliis speechamplifier is a cont i having arms 51 to 56. inl character disclosed inPatent 1,215,133, granted B. VJ. Kendall. Associated with the incoming'end are a plurality of artificial n- V-lo il2 and i3 connected to thespeech a .Y incr by an automatic switch le havi lo to 48, inclusive, anda stepping l ainV a stepping magnet 57. serves to extend theconductors-i 31 ncoining end of the speech amplifier a various types orattenuating netersed by arms 51 to 5l, inclusive.

Should the incomingr call have originated tlie eroup of lines served byswitch 1, then accoix to our assumptions, relay 13 will be -ne K erlllierefore, a circuit will be extended f the armature and rom ground,

fron-,t Contact of relay 1f', the armature and baci; contact of relay58, windingt of relay 59, outer right hand armature and front contact ofrelay 18, front Contact and innermost armature of relay 3G, conductor 60to the lira coi "ts traversed by arm of switch 50 and arni of switch lt.

Upon the operation of relay 30, hereinbefore described, a connectionwill be established from ground, interrupter G1, conductor G2, backContact and right hand armature rela,7 33, armature 63 of relay 30, and

ont contact associated therewith, windstepping' magnet 5'? to batteryand laround. [it the same time a circuit is established from ground,interruptor (il, conductor (32, back contact and left hand armature ofrelay front Contact and armature (i4- of relay 30, winding of steppingmagnet 49, to battery and ground. Under the control f interrupter G1,both switches 44 and 50 will be stepped forward until the arms t? and 55of these switches, respectively, reach their first contacts whereuponrelays and M he connected through the or will windingof relay 59 to theground controlled by relay 1G. Bela' 59 becomes energized and locksthrougijh its inner right hand armature and front contact to the groundsupplied by armature of relay 1G. At the saine time a circuit isestablished from ground, armature and front contact of relay 16, outerright hand armature and front Contact of relay 59, winding of relayV 58to battery and ground. Relay 56 onergizes an locks through its armaturedirectly to "h ground supplied over the armature of relay 16. iks soon,however, as either relay 33 or 34 attracts its armature, a circuit willbe eirtended from ground, the outer right hand armature and frontcontact of relay 26, conductor 32, normal contact and left hand armatureof relay 33 or normal contact and right band armature of relay 34,andthence thro either a 55 or arm 47 to conductor 60, therebyshort-circuiting relay 59 and causing it to become deenergized. Vlithrelay 59 deenergized and relay 56 locked, the ground until then suppliedover the outer right hand armature and front contact of relay 13 isdisconnected and conductor 60 thereby freed. Tf this conductor 60 isfreed before either relay 33 or 34 has complete-:l its movement, thenthe marking ground will be maintained by the relay which first becameenergized. The energization of relay 33 stops further movement of switch50 and the energization of relay34 stops further movement of switch 44.

When both relays 33 and 34 have become energized, the ground which wasextended to conductor 35 willbe disconnected and relay 36 will becomedeenergized, thereby preventing the possibility of an inaccurate settingof either of such switches as 44 or 50 which may bev associated withanother speech amafb . plifier such as that assumed to be containedwithin the rectangle marked 3a.

Thus a line calling over selector 1 will require artificial network 43to be connected to the speech amplifier and an attenuating networkinterposed in the line such as that connected between the first contactsof switch traversed by arms 5l, 52, 53 and 54.

Should the incoming call have originated in the group of lines served byswitch 5, then relay 14 would be energized and a circuit establishedover the outer right hand armature and front contact of relay 14,through the associated contact and armature ofrelay 36, to conductor 65,thus marking the second contacts of switches 50 and 44. Hence, a linecalling over selector 5 will require an artificial network 42 to beconnected to the speech am* plifier and an H type attenuating networkinterposed in the line through the second contacts of switch 50.

The connection having been set up through switches 1 and 12 and thenceover conductors 31 to the speech amplifier in the upper part of Fig. 3will now extend through one of the load distributing switches 66, 67 orothers,

which are indicated by the downwardly extending conductors at the bottomof Fig. 3. The particular one of these switches to be used will bedetermined by the level upon which the brushes of switch12 have beenset.

Thus it was assumed that switch 12 was set on its second level resultingin the energization of relay 26. Switch 67 corresponds to the vsecondlevel of the selector 12 and switch 66 corresponds to the iirst levelthereof. Therefore, a connection will `be established from ground,interruptor 61, conductor 62, back contact and armature 68 of relay 69,conductor 70, inner left hand armature and front contact of relay 26,conductor 71,4to the winding 72 of the stepping magnet controllingswitch 67. The stepping magnet thereupon moves the arms 73 to 7 8,inclusive, forward step by step. Let it be assumed now that the firstcontacts traversed by the arma of selector 6.7 are busy. This conditionwill be denoted by a ground connection to the winding of relay 79, sothat when arm 77 makes connection thereto, relay 69 cannot be operated.A circuit extends from ground, the armature 80 of relay 30, conductor81, through the lower high resistance and upper low resistancewinding-of relay 69 in series to arm 77. Therefore, with a groundconnection to the winding of relay 79, relay 69 does not become operatedand the arms of the switch 67 pass on to their next contacts. Let it beassumed that the second contacts traversed by the arms ofthis switch 67are idle. Therefore, theV ground connection extended through thewindings of relay 69 to switch arm 77 will be extended to the winding ofrelay 82 and thence to battery and ground. Relay 69 becomes operated andthrough its innermost lower armature short-circuits its i.

high resistance winding, leaving now only its low resistance winding inseries with the winding of relay 82, relay 82 becoming energized. By theoperation of relay 69 the circuit of stepping magnet 72 isbroken and the.switch comes to rest on its second contacts.

Through its two upper armatures and front contacts, relay 69 extends theoutgoing connections from the speech amplifier to the arms and 76.

Through. the arms 73 and 74 the switch 67 now yconnects an appropriatebalancing network 83 to the outgoing end of the speech amplifier and bythe operation of relay 82 causes an appropriate attenuating network 1 tobe interposed in the line. Thus upon the operationof relay 82 aconnection is established from ground, the armature and front arm 90whereupon relay 92 becomes operated and opening the circuit of steppingmagnet 95 allows the switch 85 to come to rest whereupon an H typeattenuating network is ini terposed between the speech amplifier andrespectively, and thence through the contacts of relay to the talkingconductors leading back to the calling line. These relays in turncontrol battery and ground connections to the conductors leading to thecalled line so that by proper manipulation of the calling line anyautomatic switches connected to the called line may be operated.

At the termination of the connection, switches 1 and 12 may be restoredin any appropriate manner whereupon relays 13, 16, 26 and 30 will becomedeenergized. Upon the decnergization of relay 80, relays 33 and 84 willbecome deenergized and by closing their right and left hand contacts,respectively, will connect the interrupter 61 through the switch arms 56and 48, respectively, to the stepping magnets 57 and 49, whereupon theswitches and 44: will be returned to normal. In a similar manner relay69 will become deenergized upon the deenergization of relay 26 and aconnection will be extended from the interrupter 61 through the armature68 and arm 78 to stepping magnet 72 whereupon switch 67 will be returnedto normal. Upon the deenergization of relay 82, the ground will beremoved from the winding ot' relay 92 and this will close a circuit forthe energization of stepping magnet 95, whereupon switch will bereturned to normal.

Fig. 2a represents an organization of relays similar to those shown inthe upper part of Fig. 2 and Fig. 3a represents an organization ofswitches, speech amplifiers etc, similar to Lthat shown in the remainderof Fig. 8. It will be noted that switches 66 and 67 show multiple tapsto the conductors outgoin from their different bank contacts. It will eunderstood that the switches in Fig. 3a, for

, instance, corresponding to switches 66 and 67, will have their Contactbanks multipled to the contact banks of switches 66 and 67.

What is claimed is 1. In a telephone system, lines of diiierent f.characteristics, repeaters, automatic switches for establishingconnections from said lines to said repeaters, means for adjusting saidrepeaters in accordance with the characteristics of said lines, andmeans comprising a plurality of relays commonly associated with saidautomatic switches for selectively operating said first means.

2. In a telephone system, lines of dii'lerent characteristics,repeaters, automatic switches for establishing connections from saidlines to said repeaters, balancing and attenuating networks Jforadjusting said repeaters in accordance with the characteristics of saidlines, and means comprising a plurality of relays commonly associatedwith said automatic switches for selectively operating said irst means.

3. In a telephone system, lines of different characteristics, repeaters,automatic switches for establishing connections from said lines to saidrepeaters, means Jfor adjusting said repeaters in accordance with thecharacter istics oit' said lines, and means comprising a chain oflock-out relays commonly associated with said automatic switches forselectively operating said first means.

4. In a telephone system, lines of ditl'ercnt characteristics,repeaters, a plurality of stages of automatic switches for establishingconnections from said lines to said repeaters, means for adjusting saidrepeaters in accordance with the characteristics of said lines, andmeans comprising a chain of lock-out relays commonly associated witheach said stage of automatic switches for selectively operating saidfirst means.

In witness whereof, we hereunto subscribe our names this 111th day ofNovember, 1928.

VALTER KUS CHE. RUDOLF DAI-IMS. FRITZ PFLEIDERER.

